Name: Piston Kit 05-07 YZF250 77.00, Wossner 8612DA 2-RING, 5NL-11631-20-00
Brand: Wossner
SKU: 56-W188.A.WO

Piston Kit 05-07 YZF250 77.00, Wossner 8612DA 2-RING, 5NL-11631-20-00

Wossner
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Description

Wossner forged piston kit with a 77mm bore, designed for Yamaha WR250F, YZ250F, and Gas Gas EC250F models. This two-ring piston is engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision.

Features

Forged piston for superior strength and design
Two-ring design for performance and durability
Optimized heat transfer to cylinder walls
Elliptical design for uniform bearing surface and even thrust load distribution
Manufactured in Germany

Specifications

Bore: 77mm
Standard size piston (PN# 8612DA)
Lock Part Number: CW16
Pin Part Number: WP059
Ring Set Part Number: 770XAS-2
Displacement: 249 cm³
Stroke: 53.6mm
Clearance: 0.04mm
Wossner Compression Ratio: OEM
OEM Compression Ratio: 12.50:1
Dome Volume: -2.80 cm³
Compression Height: 22.20mm

Cross-Reference OEM Part Numbers

5NL-11631-20-00
5XC-11631-00-00

Vehicle Fitments

Yamaha WR250F (2005-2007)
Yamaha YZ250F (2005-2007)
Gas Gas EC250F (2010-2015)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	WR F 250	2001-2013
YAMAHA	YZ F 250	2001-2007
GAS-GAS	EC F 250	2010-2015
YAMAHA	WRF 250	2001-2013
YAMAHA	YZ F 250	2005-2007
YAMAHA	WRF 250	2005-2013
YAMAHA	WR F 250	2005-2013
YAMAHA	YZF 250	2001-2007
YAMAHA	YZF 250	2005-2007
YAMAHA	YZF 250	2001-2003

Piston Kit 05-07 YZF250 77.00, Wossner 8612DA 2-RING, 5NL-11631-20-00

Wossner
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Wossner forged piston kit with a 77mm bore, designed for Yamaha WR250F, YZ250F, and Gas Gas EC250F models. This two-ring... Read more

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SKU: 56-W188.A.WO

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Description

Wossner forged piston kit with a 77mm bore, designed for Yamaha WR250F, YZ250F, and Gas Gas EC250F models. This two-ring piston is engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision.

Features

Forged piston for superior strength and design
Two-ring design for performance and durability
Optimized heat transfer to cylinder walls
Elliptical design for uniform bearing surface and even thrust load distribution
Manufactured in Germany

Specifications

Bore: 77mm
Standard size piston (PN# 8612DA)
Lock Part Number: CW16
Pin Part Number: WP059
Ring Set Part Number: 770XAS-2
Displacement: 249 cm³
Stroke: 53.6mm
Clearance: 0.04mm
Wossner Compression Ratio: OEM
OEM Compression Ratio: 12.50:1
Dome Volume: -2.80 cm³
Compression Height: 22.20mm

Cross-Reference OEM Part Numbers

5NL-11631-20-00
5XC-11631-00-00

Vehicle Fitments

Yamaha WR250F (2005-2007)
Yamaha YZ250F (2005-2007)
Gas Gas EC250F (2010-2015)

Vehicle Compatibility

Please check the exact model and year before ordering.

Manufacturer	Model	Years
YAMAHA	WR F 250	2001-2013
YAMAHA	YZ F 250	2001-2007
GAS-GAS	EC F 250	2010-2015
YAMAHA	WRF 250	2001-2013
YAMAHA	YZ F 250	2005-2007
YAMAHA	WRF 250	2005-2013
YAMAHA	WR F 250	2005-2013
YAMAHA	YZF 250	2001-2007
YAMAHA	YZF 250	2005-2007
YAMAHA	YZF 250	2001-2003

Shipping & Delivery

How long will my item take to arrive?

Orders are typically dispatched within 1 working day and are shipped on a 24hour (non-guaranteed) service.

Where do you ship to?

We currently only ship orders within the UK.

How can I track my order?

Once your order has been dispatched, you will receive a tracking code. Tracking information is emailed to the email address that was provided when placing the order.

Can I collect my order?

Unfortunately we do not offer order collections from our fulfilment centre.